Working condition self-adaptive methanol synthesis system

Abstract

The utility model discloses a working condition self-adaptive methanol synthesis system and belongs to the field of chemical engineering. The methanol synthesis system disclosed by the utility model solves the technical problem that the overall conversion per pass and the overall synthesis rate are low due to the overall structure of the existing methanol synthesis system. The power generation and energy storage module is connected with the hydrogen production and storage module, and the hydrogen production and storage module is connected with the methanol synthesis tower and the exhaust gas incinerator; the CO2 complementing and storing module is connected with the methanol synthesis tower, the methanol synthesis tower is connected with the cooling and separating module, and the cooling and separating module is respectively connected with the crude methanol storage tank and the hydrogen screening purge gas device; the crude methanol storage tank is connected with the distillation tower, the distillation tower is connected with the refined methanol storage tank, and the hydrogen screening purge gas device is respectively connected with the circulating gas treatment and storage equipment and the exhaust gas incinerator; the circulating gas treatment and storage equipment is connected with the methanol synthesis tower, and the exhaust gas incinerator is connected with the refrigerating unit. The conversion per pass of methanol in the methanol synthesis tower can be effectively improved. The methanol synthesis device is used for methanol synthesis.

Description

Technical Field

[0001] This utility model relates to an adaptive methanol synthesis system, belonging to the field of chemical engineering. Background Technology

[0002] Against the backdrop of increasingly prominent global energy structure and environmental problems, the search for a methanol synthesis technology that can both reduce greenhouse gas emissions and efficiently utilize renewable energy is particularly urgent. Traditional methanol synthesis technologies mainly rely on fossil fuels such as natural gas and coal. These methods not only consume enormous amounts of energy but also generate large amounts of CO2 emissions during the production process, exacerbating the problem of global climate change.

[0003] Currently, some process routes for producing methanol using carbon dioxide combined with green hydrogen have emerged. However, due to the significant fluctuations in green hydrogen production, similar to those seen in wind and solar power generation, it is difficult to maintain consistent gas composition within the reactor. Furthermore, the catalytic synthesis of methanol from CO2 and hydrogen is highly sensitive to temperature and gas composition ratios; existing technologies have failed to rapidly adjust to optimal operating parameters in response to changes in temperature and gas composition, resulting in low overall single-pass conversion and overall synthesis rates.

[0004] In summary, existing methanol synthesis systems suffer from low overall single-pass conversion rate and overall synthesis rate due to their overall structural design. Utility Model Content

[0005] The present invention aims to solve the technical problem of low overall single-pass conversion rate and overall synthesis rate in the existing methanol synthesis system due to its overall structure, and to provide an adaptive methanol synthesis system.

[0006] The technical solution of this utility model is an adaptive methanol synthesis system, which includes a power generation and energy storage module, a hydrogen production and storage module, a CO2 replenishment and storage module, a methanol synthesis tower, a cooling and separation module, a crude methanol storage tank, a distillation tower, a refined methanol storage tank, a hydrogen screening and venting device, a circulating gas treatment and storage device, an exhaust gas incinerator, and a refrigeration unit.

[0007] The power generation and energy storage module is connected to the hydrogen production and storage module, which is in turn connected to the methanol synthesis tower and the exhaust gas incinerator.

[0008] The CO2 collection and storage module is connected to the methanol synthesis tower, the methanol synthesis tower is connected to the cooling and separation module, and the cooling and separation module is connected to the crude methanol storage tank and the hydrogen sieving and venting device, respectively.

[0009] The crude methanol storage tank is connected to the distillation tower, the distillation tower is connected to the refined methanol storage tank, and the hydrogen venting device is connected to the circulating gas treatment and storage equipment and the exhaust gas incinerator, respectively.

[0010] The circulating gas treatment and storage equipment is connected to the methanol synthesis tower, and the exhaust gas incinerator is connected to the refrigeration unit.

[0011] As another improvement of this utility model, the power generation and energy storage module includes a power generation device and an energy storage device connected in sequence, and the energy storage device is connected to the hydrogen production and storage module.

[0012] As another improvement of this utility model, the hydrogen production and storage module includes a hydrogen production device and a hydrogen storage device connected in sequence, an energy storage device connected to the hydrogen production device, and a hydrogen storage device connected to a methanol synthesis tower and an exhaust gas incinerator respectively.

[0013] As another improvement of this utility model, the CO2 replenishment and storage module includes a CO2 replenishment device and a CO2 storage device connected in sequence, and the CO2 storage device is connected to the methanol synthesis tower.

[0014] As another improvement of this utility model, the cooling separation module includes a cooler and a separator connected in sequence, and the methanol synthesis tower is connected to the cooler.

[0015] As another improvement of this utility model, it also includes a synthesizer control system, which is connected to the power generation and energy storage module, the hydrogen production and storage module, the CO2 replenishment and storage module, the methanol synthesis tower, the hydrogen screening and purge gas device, and the circulating gas treatment and storage equipment.

[0016] As another improvement of this utility model, the methanol synthesis tower includes a mixer, a preheater, a blender, a reactor, and a re-reactor arranged in sequence.

[0017] As another improvement of this utility model, the synthesizer control system is connected to the preheater, reactor and re-reactor respectively.

[0018] The beneficial effects of this utility model are:

[0019] The synthesizer control system is connected to the power generation and storage module, hydrogen production and storage module, CO2 replenishment and storage module, methanol synthesis tower, hydrogen screening and purge gas device, and circulating gas treatment and storage equipment. This ensures that the reactor operating parameters within the methanol synthesis tower are always at the optimal operating temperature for the current mixed reaction gas composition ratio. This effectively improves the single-pass conversion rate of methanol within the methanol synthesis tower, increases methanol synthesis efficiency, and reduces system energy consumption. Through core control logic, it effectively compensates for the load fluctuations caused by green electricity hydrogen production, achieving adaptive adjustment of operating conditions and expanding the application scenarios of CO2 hydrogenation to methanol technology. The overall connection relationship of the methanol synthesis system is reasonable and efficient, ensuring that the feed gas components of different compositions are always under optimal temperature and pressure during the methanol synthesis process, effectively improving methanol yield and significantly reducing synthesis energy consumption. Attached Figure Description

[0020] Figure 1This is a process flow diagram of an adaptive methanol synthesis system according to the present invention. Detailed Implementation

[0021] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. The invention will be described in detail below with reference to the accompanying drawings. To ensure clarity and conciseness, this specification does not include all technical details. However, it should be recognized that in actual implementation, multiple specific decisions need to be made according to specific objectives, such as meeting the specific requirements of the system and business. These requirements may vary depending on the implementation method. At the same time, it should be understood that although the development process may be complex and time-consuming, for those skilled in the art, with the help of the content disclosed in this invention, such development tasks are routine work. Therefore, this specification aims to provide a technical framework to guide technicians in specific implementation and optimization under the technical solution of this invention.

[0022] In this technical field, terms not specifically defined, including technical and scientific terms, should be understood to be consistent with the common understanding of those skilled in the art. Furthermore, it should be recognized that defined terms should be interpreted in accordance with their meaning within the context of the prior art, and should not be given idealized or overly formal meanings unless otherwise explicitly defined herein. Therefore, the terminology used in this specification is intended to conform to the conventional understanding of those skilled in the art to ensure clear communication and accurate implementation of the technical solutions.

[0023] Specific implementation method one: Combining Figure 1 This embodiment describes a power generation and energy storage module, a hydrogen production and storage module, a CO2 replenishment and storage module, a methanol synthesis tower 40, a cooling and separation module, a crude methanol storage tank 60, a distillation tower 70, a refined methanol storage tank 80, a hydrogen screening and venting device 90, a circulating gas treatment and storage device 100, an exhaust gas incinerator 110, and a refrigeration unit 120.

[0024] The power generation and energy storage module is connected to the hydrogen production and storage module, which is connected to the methanol synthesis tower 40 and the exhaust gas incinerator 110, respectively.

[0025] The CO2 collection and storage module is connected to the methanol synthesis tower 40, the methanol synthesis tower 40 is connected to the cooling and separation module, and the cooling and separation module is connected to the crude methanol storage tank 60 and the hydrogen sieve purge gas device 90 respectively.

[0026] The crude methanol storage tank 60 is connected to the distillation tower 70, the distillation tower 70 is connected to the refined methanol storage tank 80, and the hydrogen venting device 90 is connected to the circulating gas treatment and storage equipment 100 and the exhaust gas incinerator 110 respectively.

[0027] The circulating gas treatment and storage device 100 is connected to the methanol synthesis tower 40, and the exhaust gas incinerator 110 is connected to the refrigeration unit 120.

[0028] The feed gas in this embodiment consists of three types: hydrogen, CO2, and non-condensable recycle gas. The hydrogen is green hydrogen, produced through a combination of wind and solar power generation and water electrolysis. The CO2 is collected industrially using CCUS technology. The non-condensable recycle gas is the gas recovered from the methanol synthesis tower outlet after condensation, separation, and partial purge. After passing through hydrogen treatment and storage equipment, CO2 through CO2 treatment and storage equipment, and the non-condensable recycle gas through recycle gas treatment and storage equipment, the hydrogen is sent to the mixer in the methanol synthesis tower for preliminary mixing to become the feed gas. The feed gas is preheated and mixed within the methanol synthesis tower before entering the reactor for catalytic methanol synthesis, generating methanol-rich gas. After leaving the methanol synthesis tower, the methanol-rich gas enters a cooling and separation module, forming liquid crude methanol and gaseous non-condensable gas. Non-condensable gases are fed into the hydrogen purge unit. Part of the non-condensable gases serve as feed gas for the non-condensable recirculation gas, which is then processed and stored again before entering the methanol synthesis tower for further reaction. The other part of the non-condensable gases is fed into the exhaust gas incinerator, where it is burned together with hydrogen produced by green electricity to generate heat, providing energy for the refrigeration unit. The incineration exhaust gas is then treated before being discharged. Meanwhile, the crude methanol collected by the cooling separation module is stored in a crude methanol storage tank and pumped to a distillation tower for rectification. The resulting refined methanol is stored in a refined methanol storage tank for future use or sale, while the waste liquid is returned to the crude methanol storage tank or treated for discharge.

[0029] The cooling capacity generated by the refrigeration unit is supplied to the methanol synthesis tower, removing the heat of the synthesis reaction and ensuring a stable reaction temperature. In addition, the refrigeration unit cools the water electrolysis hydrogen production, coolers, and plant circulating water, ensuring the normal operation of the process.

[0030] This embodiment provides an adaptive methanol synthesis system that addresses the issue of gas composition variations caused by fluctuations in green electricity supply. It automatically adjusts the preheating, reaction, and secondary reaction temperatures within the methanol synthesis tower based on the feed gas composition, ensuring that feed gases with different components are always under optimal temperature and pressure during the methanol synthesis process. This effectively improves methanol yield and significantly reduces synthesis energy consumption.

[0031] Specific Implementation Method Two: Combining Figure 1 This embodiment differs from Specific Embodiment 1 in that the power generation and energy storage module includes a power generation device 11 and an energy storage device 12 connected in sequence, with the energy storage device 12 connected to the hydrogen production and storage module. Other components and connections are the same as in Specific Embodiment 1.

[0032] Specific implementation method three: Combining Figure 1 This embodiment differs from specific embodiment one in that the hydrogen production and storage module includes a hydrogen production device 21 and a hydrogen storage device 22 connected in sequence. The energy storage device 12 is connected to the hydrogen production device 21, and the hydrogen storage device 22 is connected to the methanol synthesis tower 40 and the exhaust gas incinerator 110, respectively. Other components and connection methods are the same as in specific embodiment one or two.

[0033] Specific implementation method four: Combination Figure 1 This embodiment differs from specific embodiment one in that the CO2 replenishment and storage module includes a CO2 replenishment device 31 and a CO2 storage device 32 connected in sequence, with the CO2 storage device 32 connected to the methanol synthesis tower 40. Other components and connections are the same as in any one of specific embodiments one to three.

[0034] Specific Implementation Method Five: Combining Figure 1 This embodiment differs from specific embodiment one in that the cooling separation module includes a cooler 51 and a separator 52 connected in sequence, and the methanol synthesis tower 40 is connected to the cooler 51. Other components and connections are the same as in any one of specific embodiments one to four.

[0035] Specific Implementation Method Six: Combination Figure 1 This embodiment differs from specific embodiment one in that it also includes a synthesizer control system 130. The synthesizer control system 130 is connected to the power generation and storage module, the hydrogen production and storage module, the CO2 replenishment and storage module, the methanol synthesis tower 40, the hydrogen screening and purge gas device 90, and the circulating gas treatment and storage device 100. Other components and connections are the same as in any one of specific embodiments one through five.

[0036] Specific implementation method seven: Combination Figure 1 This embodiment differs from specific embodiment one in that the methanol synthesis tower 40 includes a mixer 41, a preheater 42, a blender 43, a reactor 44, and a re-reactor 45 arranged sequentially. Other components and connections are the same as in any one of specific embodiments one through six.

[0037] Specific implementation method eight: Combination Figure 1 This embodiment differs from Specific Embodiment 1 in that the synthesizer control system 130 is connected to the preheater 42, the reactor 44, and the re-reactor 45, respectively.

[0038] The methanol synthesis process is made adaptive by utilizing a synthesizer control system. This system controls the power supplied by electrochemical energy storage to the water electrolysis hydrogen production system, regulating the total hydrogen production in the plant; it controls the flow rate of CO2 into the methanol synthesis tower, and monitors the CO2 purity and flow rate in real time; it controls the flow rate of hydrogen into the methanol synthesis tower, and monitors the hydrogen purity and flow rate in real time; it controls the flow rate of non-condensable gas into the methanol synthesis tower, and monitors the gas composition distribution and flow rate of the non-condensable gas in real time; it controls the heating power of the preheater in the methanol synthesis tower, calculating the optimal reaction temperature based on the proportions and flow rates of all components of CO2, hydrogen, and non-condensable gas, combined with the properties of catalytic methanol synthesis, and heats the mixed gas to this temperature using an electric heater in the preheater; it controls the reactor temperature in the methanol synthesis tower, and based on the calculated optimal reaction temperature, it controls the cooling capacity supplied by the refrigeration unit to ensure the reaction... The reactor temperature is the optimal reaction temperature; the heating power of the re-reactor in the methanol synthesis tower is controlled, the reactor outlet air temperature is detected, and the mixer is heated to the theoretical optimal reaction temperature based on the current mixer composition ratio and flow rate provided by the real-time calculation center, ensuring that the re-reactor temperature is the optimal reaction temperature; the purge gas flow rate of the hydrogen screening purge gas device is controlled, and the inlet gas composition of this device is monitored. When the nitrogen content exceeds the predetermined range, the hydrogen screening is started and the non-condensable gas after hydrogen screening is purged to the exhaust gas incinerator; when the nitrogen content is within the rated range, the hydrogen screening is shut down and all non-condensable gas is sent to the circulating gas treatment and storage equipment; the exhaust gas boiler heat load is controlled, and the heat required for the whole plant process is provided by the real-time calculation center. By adjusting the amount of hydrogen provided by the hydrogen treatment and storage equipment, the exhaust gas boiler heat load is adjusted to generate corresponding heat, achieving energy matching.

[0039] Other components and connection methods are the same as any one of the specific embodiments one to seven.

[0040] Combination Figure 1 Explanation of the working principle of this utility model:

[0041] The hydrogen processing and storage, CO2 processing and storage, and recycle gas processing and storage systems each include compression and storage equipment for the relevant gases. Wind and solar power generation, combined with electrochemical energy storage, provides renewable green electricity for the entire methanol synthesis system. Hydrogen production through water electrolysis, combined with hydrogen processing and storage, provides some feedstock gas and fuel for methanol synthesis and the exhaust gas incinerator, while also providing combustion oxygen for the exhaust gas incinerator. CO2 replenishment, combined with CO2 processing and storage, provides some feedstock gas for methanol synthesis. The recycle gas processing and storage system receives unreacted recycle gas and provides some feedstock gas for methanol synthesis. The methanol synthesis tower receives hydrogen, CO2, and non-condensable recycle gas, and the methanol synthesis reaction occurs, producing methanol-rich gas. A cooler combined with a separator separates the methanol-rich gas into liquid and gaseous products. A crude methanol storage tank collects the liquid products and unevaporated liquid from the methanol synthesis reaction and supplies them to a distillation tower. The distillation tower purifies the liquid products, producing refined methanol and unevaporated liquid, and stores the refined methanol in a refined methanol storage tank. The hydrogen purge gas unit receives non-condensable gaseous products from the separator, separates hydrogen from other non-condensable gases, and purges a certain proportion of the other non-condensable gases based on the detected gas composition. The exhaust gas incinerator uses oxygen produced as a byproduct of water electrolysis for combustion, and the purge gas and hydrogen produced from water electrolysis as fuel. It burns the purge gas to generate heat, which is supplied to the refrigeration unit. The refrigeration unit uses the heat generated by the exhaust gas incinerator as a high-temperature heat source to produce cooling energy, which is supplied to the water electrolysis hydrogen production and methanol synthesis towers.

[0042] The main control logic of the synthesizer control system is as follows: 1. Control the hydrogen production from water electrolysis and the hydrogen production power; 2. Monitor the CO2 treatment and storage, CO2 flow rate and purity; 3. Monitor the hydrogen treatment and storage, hydrogen flow rate and purity; 4. Monitor the circulating gas treatment and storage, non-condensable circulating gas flow rate and gas composition ratio; 5. Control the methanol synthesis tower preheater and the electric heating power; 6. Control the methanol synthesis tower reactor and the input cooling capacity; 7. Control the methanol synthesis tower re-reactor and the electric heating power; 8. Control the hydrogen sieve release device and the release rate of other non-condensable gases; 9. Control the exhaust gas incinerator and the heat load.

[0043] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A condition-adaptive methanol synthesis system, characterized in that... It includes a power generation and energy storage module, a hydrogen production and storage module, a CO2 replenishment and storage module, a methanol synthesis tower (40), a cooling and separation module, a crude methanol storage tank (60), a distillation tower (70), a refined methanol storage tank (80), a hydrogen screening and release gas device (90), a circulating gas treatment and storage device (100), an exhaust gas incinerator (110), and a refrigeration unit (120). The power generation and energy storage module is connected to the hydrogen production and storage module, which is connected to the methanol synthesis tower (40) and the exhaust gas incinerator (110) respectively. The CO2 replenishment and storage module is connected to the methanol synthesis tower (40), the methanol synthesis tower (40) is connected to the cooling and separation module, and the cooling and separation module is connected to the crude methanol storage tank (60) and the hydrogen sieve release device (90) respectively. The crude methanol storage tank (60) is connected to the distillation tower (70), the distillation tower (70) is connected to the refined methanol storage tank (80), and the hydrogen venting device (90) is connected to the circulating gas treatment and storage equipment (100) and the exhaust gas incinerator (110), respectively. The circulating gas treatment and storage device (100) is connected to the methanol synthesis tower (40), and the exhaust gas incinerator (110) is connected to the refrigeration unit (120).

2. The adaptive methanol synthesis system according to claim 1, characterized in that, The power generation and energy storage module includes a power generation device (11) and an energy storage device (12) connected in sequence, and the energy storage device (12) is connected to the hydrogen production and storage module.

3. The adaptive methanol synthesis system according to claim 2, characterized in that, The hydrogen production and storage module includes a hydrogen production device (21) and a hydrogen storage device (22) connected in sequence. The energy storage device (12) is connected to the hydrogen production device (21), and the hydrogen storage device (22) is connected to the methanol synthesis tower (40) and the exhaust gas incinerator (110) respectively.

4. The adaptive methanol synthesis system according to claim 1, characterized in that, The CO2 replenishment and storage module includes a CO2 replenishment device (31) and a CO2 storage device (32) connected in sequence, and the CO2 storage device (32) is connected to the methanol synthesis tower (40).

5. The adaptive methanol synthesis system according to claim 1, characterized in that, The cooling and separation module includes a cooler (51) and a separator (52) connected in sequence, and the methanol synthesis tower (40) is connected to the cooler (51).

6. The adaptive methanol synthesis system according to claim 1, characterized in that... It also includes a synthesizer control system (130), which is connected to the power generation and storage module, the hydrogen production and storage module, the CO2 replenishment and storage module, the methanol synthesis tower (40), the hydrogen screening and release gas device (90), and the circulating gas treatment and storage device (100).

7. The adaptive methanol synthesis system according to claim 6, characterized in that, The methanol synthesis tower (40) includes a mixer (41), a preheater (42), a blender (43), a reactor (44), and a re-reactor (45) arranged in sequence.

8. The adaptive methanol synthesis system according to claim 7, characterized in that, The synthesizer control system (130) is connected to the preheater (42), reactor (44) and re-reactor (45), respectively.

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